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The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
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IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...
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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
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IntroductionA range of clinical features characterizes Mitral Valve Prolapse (MVP), but it is important to note that many individuals with MVP are asymptomatic and may remain so throughout their lives. For those who do exhibit symptoms, the following are the key clinical features:Palpitations: This is a common symptom where individuals feel an irregular or rapid heartbeat. Palpitations in MVP are often due to arrhythmias such as premature ventricular contractions or supraventricular...
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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Mnemonic devices are cognitive tools that facilitate memory retention by linking new information to familiar patterns or organizational strategies. These techniques are beneficial for remembering complex or lengthy sets of information by simplifying and structuring them in easily retrievable ways.
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A valve-based microfluidic device for on-chip single cell treatments.

Yue Sun1, Bo Cai2, Xiaoyun Wei1

  • 1School of Physics and Technology, Wuhan University, Wuhan, P. R. China.

Electrophoresis
|August 30, 2018
PubMed
Summary

This study introduces a novel microfluidic platform for simultaneous single-cell immobilization and treatment. The device enables non-destructive cell collection for further analysis, advancing cellular research.

Keywords:
Droplet microfluidicsPneumatic valveSingle cellStaining

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Cell Biology

Background:

  • Single-cell analysis is crucial for understanding cellular mechanisms and heterogeneity.
  • Existing microfluidic devices often damage cells or fail to immobilize them for simultaneous reagent manipulation.
  • There is a need for advanced platforms that can perform on-chip single-cell assays without cell damage.

Purpose of the Study:

  • To develop a two-layer pneumatic valve-based microfluidic platform for simultaneous cell immobilization and treatment.
  • To enable non-destructive collection of treated cells for downstream analysis.
  • To demonstrate the platform's utility in single-cell biochemical assays.

Main Methods:

  • Cells were encapsulated in sodium alginate droplets, which solidified into hydrogel beads upon reaction with Ca2+.
  • Hydrogel bead size was controlled by modulating flow rates of continuous and disperse phases.
  • Integrated pneumatic valves regulated fluid resistance for on-chip capture and release of hydrogel beads.

Main Results:

  • The platform successfully achieved simultaneous cell immobilization and treatment on-chip.
  • Hydrogel bead size was precisely controlled.
  • On-chip capture and release of hydrogel beads were demonstrated.
  • Cellular live/dead staining was successfully performed as a proof of concept.

Conclusions:

  • The developed pneumatic valve-based platform offers a novel solution for on-chip single-cell manipulation and treatment.
  • This method allows for non-destructive cell processing and collection.
  • The platform has significant potential for advancing biochemical cellular assays and single-cell analysis.